Linear valve pneumatic actuator

Abstract

The utility model discloses a linear type valve pneumatic actuator which comprises a cylinder barrel, a piston block is connected to the inner side surface of the cylinder barrel in a sliding mode, an actuating rod is fixedly connected to the lower surface of the piston block, a spring is installed on the outer surface of the actuating rod in a sleeved mode, and the outer surface of the piston block is tightly attached to the inner side surface of the cylinder barrel. A supporting pipe barrel is arranged on the upper surface of the cylinder barrel, a positioning protrusion is arranged on the inner side surface of the lower end of the supporting pipe barrel, an extrusion screw is connected to the inner side surface of the positioning protrusion through threads, the extrusion screw is of a long screw structure, a supporting pipe barrel structure is arranged at the upper end of the cylinder barrel, and the extrusion screw is arranged for adjustment inside. When the piston rod needs to be manually controlled to descend, the threaded cover can be opened, and the extrusion screw is twisted downwards, so that the compression control part of the cylinder barrel is of a sealing structure during normal pneumatic use, the air leakage phenomenon is avoided, and pneumatic execution control is not influenced.

Description

Technical Field

[0001] The utility model relates to the field of linear valve pneumatic actuators, and more specifically, to a linear valve pneumatic actuator. Background Art

[0002] A pneumatic actuator is a device that uses air pressure to drive the opening and closing or adjustment of a valve. It is also known as a pneumatic actuator or pneumatic device, but is generally popularly called a pneumatic head. Sometimes, a pneumatic actuator is also equipped with certain auxiliary devices, commonly including a valve positioner and a handwheel mechanism. The function of the valve positioner is to improve the performance of the actuator using the feedback principle, so that the actuator can accurately position according to the control signal of the controller. The function of the handwheel mechanism is that when the control system has a power outage, a gas outage, the controller has no output, or the actuator fails, it can be used to directly operate the control valve to maintain the normal operation of production.

[0003] Pneumatic actuators can be divided into double-acting pneumatic actuators and single-acting pneumatic actuators. For a single-acting pneumatic actuator, the valve is opened when air is supplied, and automatically closes when there is no air supply, and it automatically resets by a spring. In the case of a single-acting pneumatic actuator when there is no air supply, since the gas cannot quickly discharge from the exhaust hole, the gas inside the pneumatic actuator continues to compress the spring, and the spring cannot return to its original state, resulting in the valve not being able to close quickly.

[0004] In the prior art, the authorized publication number CN221075446U of the utility model discloses a pneumatic actuator, which includes a pneumatic actuator housing. An air-operated structure is assembled at the lower end of the inner cavity of the pneumatic actuator housing. A screw-type manual structure is assembled between the middle of the upper surface of the air-operated structure and the upper end of the pneumatic actuator housing. A sealing enhancement structure is assembled between the bottom surface of the top of the air-operated structure and the bottom surface of the inner cavity of the pneumatic actuator housing. A ring-shaped flexible airbag is adhesively fixed to the lower end of the outer wall of the pneumatic actuator housing, and the ring-shaped flexible airbag is communicated with the gas output end of the pneumatic actuator housing; the outer side of the gas output end of the pneumatic actuator housing is fixedly communicated with the ring-shaped flexible airbag. By pressing the ring-shaped flexible airbag, the gas inside the pneumatic actuator can be quickly discharged from the one-way exhaust valve, so that the gas inside the pneumatic actuator will not continue to compress the spring, enabling the spring to quickly return to its original state and realizing the quick closing of the valve.

[0005] In the above patent, when in use, a threaded rod member mechanism is provided, which needs to be twisted up and down for adjustment inside the cylinder structure. When there is no power, it can be manually pressed down to operate the piston. Since the actuator is a pneumatic structure and realizes the control of the piston up and down by inflating, the connection of the threaded rod is a threaded hole and cannot achieve sealing, and air leakage will occur during use, affecting the pneumatic execution control. Summary of the Utility Model

[0006] In view of the problems existing in the prior art, the purpose of the present utility model is to provide a linear valve pneumatic actuator, which is provided with a support tube structure at the upper end of the cylinder barrel, and is provided with an extrusion screw for internal adjustment. When it is necessary to manually control the piston rod to descend, the threaded cover can be opened and the extrusion screw can be turned downward. With such a structure, when the pneumatic actuator is in normal use, the compression control part of the cylinder barrel is a sealed structure, and there will be no air leakage phenomenon, which does not affect the pneumatic actuator control.

[0007] To solve the above problems, the present utility model adopts the following technical solutions.

[0008] A linear valve pneumatic actuator includes a cylinder barrel. The inner surface of the cylinder barrel is slidably connected with a piston block. The lower surface of the piston block is fixedly connected with an actuator rod. A spring is sleeved on the outer surface of the actuator rod. The outer surface of the piston block is closely attached to the inner surface of the cylinder barrel. A support tube is arranged on the upper surface of the cylinder barrel. A positioning protrusion is arranged on the inner surface of the lower end of the support tube. An extrusion screw is connected to the inner surface of the positioning protrusion by a thread. The extrusion screw adopts a long screw structure. An air inlet protrusion is arranged on the outer surface of the side of the support tube. The air inlet protrusions are distributed on the outer surface of the lower end of the support tube. The upper outer surface of the support tube is connected with a sealing cover by a thread. A support tube structure is arranged at the upper end of the cylinder barrel, and an extrusion screw is arranged inside for adjustment. When it is necessary to manually control the piston rod to descend, the threaded cover can be opened and the extrusion screw can be turned downward. With such a structure, when the pneumatic actuator is in normal use, the compression control part of the cylinder barrel is a sealed structure, and there will be no air leakage phenomenon, which does not affect the pneumatic actuator control.

[0009] Furthermore, the sealing cover is connected to the inner surface of the support tube by a thread, and the sealing cover adopts a hexagonal concave cover structure, with a hexagonal protrusion structure on the outer surface. And a rubber sealing pad is sleeved on the upper outer surface of the support tube. The lower surface of the sealing cover is pressed and fixed on the upper surface of the rubber sealing pad.

[0010] Furthermore, exhaust holes are opened on the lower surface of the cylinder barrel, and the exhaust holes are distributed on both sides of the lower surface of the cylinder barrel.

[0011] Furthermore, an opening is arranged on the inner surface of the lower end of the cylinder barrel, and the outer surface of the actuator rod is inserted into the inner surface of the opening of the cylinder barrel.

[0012] Furthermore, a circular groove is opened on the inner surface of the lower end of the cylinder barrel, and the lower outer surface of the spring is clamped on the inner surface of the circular groove.

[0013] Further, a sealing ring is fixedly installed on the outer surface of the piston block. The outer surface of the sealing ring is extruded against the inner surface of the cylinder barrel. The sealing ring is made of nitrile rubber material. Annular positioning grooves are formed at the upper and lower ends of the outer surface of the piston block, and the outer surface of the sealing ring is snapped into the annular positioning grooves.

[0014] Further, convex seats are arranged on the upper end surface of the cylinder barrel. The convex seats are distributed on both sides of the cylinder barrel, and mounting holes are arranged on the surfaces of the convex seats.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] (1) A support tube structure is arranged at the upper end of the cylinder barrel, and an extrusion screw is arranged inside for adjustment. When it is necessary to manually control the piston rod to descend, the threaded cover can be opened and the extrusion screw can be twisted downward. In this way, when the pneumatic device is in normal use, the compression control part of the cylinder barrel is a sealed structure, and there will be no air leakage phenomenon, which does not affect the pneumatic execution control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic view of the overall structure of the present utility model;

[0018] Figure 2 is a bottom view of the overall structure of the present utility model;

[0019] Figure 3 is a sectional view of the overall structure of the present utility model;

[0020] Figure 4 is a partial structural view of the piston block and the actuator rod of the present utility model.

[0021] Explanation of the reference numerals in the drawings:

[0022] 1 cylinder barrel, 2 piston block, 3 actuator rod, 4 spring, 5 support tube, 6 positioning protrusion, 7 extrusion screw, 8 air inlet protrusion, 9 sealing cover, 10 rubber sealing pad, 11 exhaust hole, 12 circular groove, 20 sealing ring, 21 annular positioning groove, 13 convex seat. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. Embodiment

[0024] Please refer to Figures 1-4, a linear valve pneumatic actuator, comprising a cylinder barrel 1, the inner surface of the cylinder barrel 1 is slidably connected with a piston block 2, the lower surface of the piston block 2 is fixedly connected with an actuator rod 3, the outer surface of the actuator rod 3 is sleeved with a spring 4, the outer surface of the piston block 2 is closely attached to the inner surface of the cylinder barrel 1, the upper surface of the cylinder barrel 1 is provided with a support tube 5, the inner surface of the lower end of the support tube 5 is provided with a positioning protrusion 6, the inner surface of the positioning protrusion 6 is threadedly connected with an extrusion screw 7, the extrusion screw 7 adopts a long screw structure, the outer surface of the side of the support tube 5 is provided with an air inlet protrusion 8, the air inlet protrusions 8 are distributed on the outer surface of the lower end of the support tube 5, the upper outer surface of the support tube 5 is threadedly connected with a sealing cover 9; a support tube structure is arranged at the upper end of the cylinder barrel, and an extrusion screw is arranged inside for adjustment. When it is necessary to manually control the downward movement of the piston rod, the threaded cover can be opened and the extrusion screw can be twisted downward. In such a structure, when the pneumatic actuator is in normal use, the compression control part of the cylinder barrel is a sealed structure, and there will be no air leakage phenomenon, which does not affect the pneumatic actuator control;

[0025] The sealing cover 9 is threadedly connected to the inner surface of the support tube 5, and the sealing cover 9 adopts a hexagonal concave cover structure, with a hexagonal protrusion structure on the outer surface, and a rubber sealing gasket 10 is sleeved on the upper outer surface of the support tube 5, and the lower surface of the sealing cover 9 is pressed and fixed on the upper surface of the rubber sealing gasket 10; after the sealing cover 9 is installed, it can be sealed and there will be no air leakage at the top;

[0026] Exhaust holes 11 are opened on the lower surface of the cylinder barrel 1, and the exhaust holes 11 are distributed on both sides of the lower surface of the cylinder barrel 1, facilitating self-exhaust when the piston block 2 moves up and down;

[0027] An opening is provided on the inner surface of the lower end of the cylinder barrel 1, and the outer surface of the actuator rod 3 is inserted through the inner surface of the opening of the cylinder barrel 1 for easy insertion. A circular groove 12 is opened on the inner surface of the lower end of the cylinder barrel 1, and the lower outer surface of the spring 4 is clamped on the inner surface of the circular groove 12.

[0028] A sealing ring 20 is fixedly installed on the outer surface of the piston block 2, the outer surface of the sealing ring 20 is pressed against the inner surface of the cylinder barrel 1, the sealing ring 20 is made of nitrile rubber material, annular positioning grooves 21 are opened at the upper and lower ends of the outer surface of the piston block 2, and the outer surface of the sealing ring 20 is clamped into the annular positioning grooves 21, facilitating the installation of the sealing ring 20. When the piston block 2 moves up and down, it can be hermetically fitted and there will be no air leakage;

[0029] Convex seats 13 are arranged on the upper surface of the cylinder barrel 1, the convex seats 13 are distributed on both sides of the cylinder barrel 1, and mounting holes are provided on the surface of the convex seats 13, facilitating the installation and use of the cylinder barrel 1;

[0030] In use, an actuating rod 3 is fixedly connected to the lower surface of the piston block 2. A spring 4 is sleeved on the outer surface of the actuating rod 3. An air inlet protrusion 8 is provided on the outer surface of the side of the support tube 5. By introducing air through the air inlet protrusion 8 to compress the piston block 2 to descend, the actuating rod 3 can be driven to descend. When the gas is recovered, the piston block 2 can be squeezed by the spring 4 to reset and rise.

[0031] If the air pump is damaged or the power fails, it can be manually operated. At this time, a support tube 5 is provided on the upper surface of the cylinder 1. A positioning protrusion 6 is provided on the inner surface of the lower end of the support tube 5. The inner surface of the positioning protrusion 6 is threadedly connected to an extrusion screw 7. The extrusion screw 7 adopts a long screw structure. The outer surface of the upper end of the support tube 5 is threadedly connected to a sealing cover 9. The sealing cover 9 can be twisted off. A flat-head screwdriver can be used to twist the extrusion screw 7 to descend, and the piston block 2 can be squeezed downward to perform the manual opening operation.

[0032] When the manual mechanism is not used, the sealing cover 9 is threadedly connected to the inner surface of the support tube 5, and a rubber sealing gasket 10 is sleeved on the outer surface of the upper end of the support tube 5. The lower surface of the sealing cover 9 is squeezed and fixed on the upper surface of the rubber sealing gasket 10. After the sealing cover 9 is installed, it can be sealed, and the top of the support tube 5 will not leak air.

[0033] The sealing cover 9 adopts a hexagonal concave cover structure, and a hexagonal protrusion structure is provided on the outer surface. A socket wrench can be clamped at the hexagonal protrusion to twist the sealing cover 9 to rotate, and the installation and disassembly operations can be performed, which is convenient for operation.

[0034] The above is only the preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and its improvement concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A linear valve pneumatic actuator, comprising a cylinder barrel (1), characterized in that: A piston block (2) is slidably connected to the inner surface of the cylinder barrel (1). An actuating rod (3) is fixedly connected to the lower surface of the piston block (2). A spring (4) is sleeved on the outer surface of the actuating rod (3). The outer surface of the piston block (2) is closely attached to the inner surface of the cylinder barrel (1). A support tube (5) is provided on the upper surface of the cylinder barrel (1). A positioning projection (6) is provided on the inner surface of the lower end of the support tube (5). An extrusion screw (7) is threadedly connected to the inner surface of the positioning projection (6). The extrusion screw (7) adopts a long screw structure. An air inlet protrusion (8) is provided on the outer surface of the side of the support tube (5). The air inlet protrusions (8) are distributed on the outer surface of the lower end of the support tube (5). A sealing cover (9) is threadedly connected to the outer surface of the upper end of the support tube (5).

2. The linear valve pneumatic actuator according to claim 1, characterized in that: The sealing cover (9) is threadedly connected to the inner surface of the support tube (5), and the sealing cover (9) adopts a hexagonal concave cover structure with a hexagonal protrusion structure on the outer surface. A rubber sealing gasket (10) is sleeved on the outer surface of the upper end of the support tube (5). The lower surface of the sealing cover (9) is pressed and fixed on the upper surface of the rubber sealing gasket (10).

3. A linear valve pneumatic actuator according to claim 1, characterized in that: Exhaust holes (11) are provided on the lower surface of the cylinder barrel (1). The exhaust holes (11) are distributed on both sides of the lower surface of the cylinder barrel (1).

4. A linear valve pneumatic actuator according to claim 1, characterized in that: An opening is provided on the inner surface of the lower end of the cylinder barrel (1). The outer surface of the actuating rod (3) is inserted through the inner surface of the opening of the cylinder barrel (1).

5. A linear valve pneumatic actuator according to claim 1, characterized in that: A circular groove (12) is provided on the inner surface of the lower end of the cylinder barrel (1). The lower outer surface of the spring (4) is clamped to the inner surface of the circular groove (12).

6. The linear valve pneumatic actuator according to claim 1, wherein: A sealing ring (20) is fixedly installed on the outer surface of the piston block (2). The outer surface of the sealing ring (20) is pressed against the inner surface of the cylinder barrel (1). The sealing ring (20) is made of nitrile rubber. Annular positioning grooves (21) are provided at the upper and lower ends of the outer surface of the piston block (2). The outer surface of the sealing ring (20) is snapped into the annular positioning grooves (21).

7. The linear valve pneumatic actuator according to claim 1, wherein: Convex seats (13) are provided on the upper surface of the cylinder barrel (1). The convex seats (1

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